When French artist <a href="http://documentsdartistes.org/artistes/grossetete/repro.html">Olivier Grossetête</a> sent us these images of Pont de Singe - an intriguing "hanging bridge" that dangles from three helium-filled balloons above a lake in the UK - he included a warning. "The use of helium was sometimes criticized," he said, since helium is difficult to extract and, like all molecules, is becoming a scarce natural resource. Yet there's something so compelling about his <a href="http://inhabitat.com/aeroflorale-ii-la-machine-erects-an-animated-hanging-garden-inspired-by-da-vinci/">da Vinci-esque design</a>, which is like shock therapy for the stagnant imagination.

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Helium Bridge by Olivier Grossetête

This wonderful public art installation is suspended above a lake in the Tattum Japanese Garden park in the UK

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Helium Bridge by Olivier Grossetête

A timber walkway dangles from three helium-filled balloons

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Helium Bridge by Olivier Grossetête

The project drew some criticism due to the use of helium, however, which is a scarce resource

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Helium Bridge by Olivier Grossetête

Nobody can walk on the bridge but it does urge onlookers to think about the future of infrastructure in a changing world

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Helium Bridge by Olivier Grossetête

This work builds on a previous suspended bridge by the same artist

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Helium Bridge by Olivier Grossetête

Behold da Vinci-esque drawings of a fairytale design

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Helium Bridge by Olivier Grossetête

When French artist Olivier Grossetête sent us these images of Pont de Singe - an intriguing "hanging bridge" that dangles from three helium-filled balloons above a lake in the UK - he included a warning. "The use of helium was sometimes criticized," he said, since helium is difficult to extract and, like all molecules, is becoming a scarce natural resource. Yet there's something so compelling about his da Vinci-esque design, which is like shock therapy for the stagnant imagination.